Will upsizing from 185/55 R16 to 205/50 R16 affect in fuel economy and car acceleration assuming using the same wheels

I believe this is due to larger size but from online calculator it was way below (seems like the perfect size to upsize to) the 3 percent threshold (+0.25%) over 185/55 tires.

This post has been edited by minizian: Jul 11 2022, 03:21 PM

Thanks for the reply, I am not sure if my 6.5J wheel will be able to fit 205/50 wheels or not.

Tire shop person said cant fit while checking online the minimum width is 5.5J. Not sure who is correct who is wrong, they say its okay to fit 195/50R16 inside but the speedo will be off quite a bit

Hard to find good fitting third wheels since the stock wheels are not common offset unless go full custom which is not cheap.

Not sure if this is under your field or not.

Also, not sure which tire co your are in but I noticed some of tire brand model have different country of origin. Eg Pilot Sport 4 was made in France while the ST model was made Thailand. Likewise the same goes to Falken which certain model was made in Turkey while SEA model were made in Thailand. I believe Goodyear & Pirelli also hade made in China model & European made.

Are the quality same between country of origin for the same model of tires?

This post has been edited by minizian: Jul 12 2022, 09:37 AM

Speaking of tire and its limit, is there such place as a skid pad in Malaysia where one are able to test the car grip (especially in wet road) in safe environment.

This post has been edited by minizian: Sep 9 2022, 01:11 AM

Usually if new tires, how long for it to run in before can start pushing it?

For me I will drive normally for 1000 KM before start to push around.

Drive normal = go to work via highway at normal speed

Push around = going around genting as an example

This track was opened at one of the proton carnivals many moons ago. I recall sitting in one of the suprima over the oval track.

Closest thing to oval racing

This post has been edited by minizian: Sep 11 2022, 10:29 PM

Dear Bro epjx31

Quick question:

1)I see you have tire upsize calculator, do you have possibility of the similar table for downsizing for those in the minority?

2)
-My car ori tires is 185/55R16 and now I am driving 195/50R16 with stock wheels. I plan to downsize but I not sure to go either 195/50R15 or 195/55R15?
-I tend to rempit the car so which size is better suited for it? (Seems liek PS3 would be my choice due to wet weather all rounder performance)
-Ideally I prefer to car have sharp response Also, can both sizes it fit onto 6J wheels?
-Will there be performance issue when driving 6J wheels hard attached with either 195/50 or 195/55 wheels?
-Does downsizing to 195/55 and 195/50 15 inch wheel violate the 3% rule of thumb?

3) You as engineer do you have access to super discounted tires?

Yeah, i did went through webpage to see if it suitable or not, and those page did answered my question

But I just need a person who have hands on experience on tire engineer to give his opinion.


3 - even if the person works in tire co? I am asking specifically if such discount exists if he/she working in tire co directly. Like those super cheap air fare for those working in airlines.

I am always curious, what happen if a totally stock car was equipped with gripper tires.

Grippier tires as in those semi slick type like AD09/V720 or V730

Will the stock car suspension be overwhelmed with additional grip causing additional wear and tear?

Perhaps making the car slower since they cant take advantage of new found grip?

Does that mean upgrading stock suspension kit is essential to make full use of such tires?

This post has been edited by minizian: Aug 2 2023, 01:45 PM